memory: introduce memory_region_set_alias_offset()
Add an API to update an alias offset of an active alias. This can be
used to simplify implementation of dynamic memory banks.
Signed-off-by: Avi Kivity <avi@redhat.com>
diff --git a/memory.c b/memory.c
index a080d21..7e842b3 100644
--- a/memory.c
+++ b/memory.c
@@ -1345,6 +1345,20 @@
memory_region_transaction_commit();
}
+void memory_region_set_alias_offset(MemoryRegion *mr, target_phys_addr_t offset)
+{
+ target_phys_addr_t old_offset = mr->alias_offset;
+
+ assert(mr->alias);
+ mr->alias_offset = offset;
+
+ if (offset == old_offset || !mr->parent) {
+ return;
+ }
+
+ memory_region_update_topology(mr);
+}
+
void set_system_memory_map(MemoryRegion *mr)
{
address_space_memory.root = mr;
diff --git a/memory.h b/memory.h
index db53422..c07bcca 100644
--- a/memory.h
+++ b/memory.h
@@ -529,6 +529,18 @@
*/
void memory_region_set_address(MemoryRegion *mr, target_phys_addr_t addr);
+/*
+ * memory_region_set_alias_offset: dynamically update a memory alias's offset
+ *
+ * Dynamically updates the offset into the target region that an alias points
+ * to, as if the fourth argument to memory_region_init_alias() has changed.
+ *
+ * @mr: the #MemoryRegion to be updated; should be an alias.
+ * @offset: the new offset into the target memory region
+ */
+void memory_region_set_alias_offset(MemoryRegion *mr,
+ target_phys_addr_t offset);
+
/* Start a transaction; changes will be accumulated and made visible only
* when the transaction ends.
*/
